Key-gage.



No. 683,871. Patented (lot. I, IBM. J. ACKERLY.

KEY GAGE.

(Application filed may 6. 1901.

(No Model.)

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UNITED STATES PATENT OFFICE.

JOSEPH ACKERLY, OF PASSAIC, NEW JERSEY, ASSIGNOR OF ONE-HALF TO ANDREWLABASH, OF SAME PLACE. I

KEY-GAG E.

SFECIFICATION forming part of Letters Patent No. 683,871, dated October1, 1901.

Application filed May 6,1901. Serial No. 68,844. (No model.)

To all whom it may concern.-

Be it known that I, JOSEPH ACKERLY, a citizen of the United States,residing at 138 Second street, Passaic, county of Passaic, State of NewJersey, have invented certain new and useful Improvements in Key-Gages,fully described and represented in the following specification and theaccompanying drawings, forming a part of the same.

The object of the present invention is to furnish a cheap and convenientapparatus for measuring the angle of key-seats in pulleys and wheelswhere fitted upon a grooved shaft, so that the key to fit such key-seatmay be accurately finished without repeated fitting to the seat. Otherdevices have been made for a similar purpose and with a fixed andadjustable bar such as I employ; but mine is distinguished from othersin having one of the gage-bars formed at one end with a lateral slottedarm which, in conjunction with a pivoted link at the other end of thebar and a clamp-screw through the slotted arm, serves to readily adjustthe movable bar to thefdesired angle and to secure it firmly when thusadjusted.

The invention is shown in three different forms in the annexed drawings.

Figures 1 and 2 are an elevation and plan of the key-gage provided witha thumb-screw for adjusting the angle-bar. Fig. 3 is a longitudinalsection of a pulley-hub and shaft end with a key-gage in which theangle-bar is adjusted solely by the fingers. Figs. 4 and 5 are anelevation and plan of the key-gage having links at opposite ends of theanglebar and draw-bars attached to both of the links to adjust suchbars. The angle-bar is removed and the parts are shown in section inFig. 5 on line5 5 in Fig. 4.

a designates the base bar, from which a handle I) may be extended, ifdesired.

Referring to Fig. l, c is the lateral arm upon the base-bar and isprovided with slot d and clamp-screw e. f is the angle-bar, which isperforated for the passage of the clamp-screw and is provided with alink g near the opposite end, which link has a pivot h fitted through aslot n in the end of the base-bar. The link is shown double-that is,

with one strap upon each side of the basebar and angle bar. A draw-bar jis attached to the pivot h, and a clamp-screw 7c is journaled in abearing Z upon the base-bar and its thread fitted to a nut 1% upon thedrawbar.

It will he observed that the clamp-screw e prevents longitudinal motionof the angle barf, and the drawing of the pivot it toward ,the bearing Zby rotating the clamp-screw therefore presses the free end of theanglebar outward from the base-bar.

When the instrument is inserted in a keyway to measure the angle, as isillustrated in Fig. 3, the arm 0 is retained outside of the keyway, sothat the outer end of the anglebar may be manipulated, and such outerend is pressed out from the base-bar to fit the angle of the keyway whenthe inner end has been pressed outward by turning the clampscrew 70.When both ends of the angle-bar are thus adjusted to the angle of thekeyway, the parts are secured together by the thumbnut 6' upon theclamp-screw e, and the angle of the two bars is thus preserved.

In Fig. 3 the construction is simplified by forming a slot f in theangle-bar transverse to the slot in the armc, so that the angle-bar maybe pressed longitudinally of the basebar when both are inserted in thekeyway, thus causing the link 9 to carry the anglebar outward, while theopposite end of the angle-bar is pressed outward with the finger and theclamp-screw then secured to hold the parts in their adjusted positions.

A scale of index-marks is shown upon the base-bar in Fig. 3, (thedivisions not being numbered for want of room upon the drawings,) andthe mark upon such scale which coincides with the outer end of thekeyway may be noted when measuring the angle by which the length of thekey from the inner end of the base-bar is attained. When the instrumentis removed from the keyway, the width of the key at both ends can bereadily ascertained by applying a scale or calipers to the instrument atthe inner end and at the point where the mark upon the scale coin cidedwith the outer end of the keyway.

With the construction shown in Fig. 3 the adjustment of the angle-bar isefiected by pushingit longitudinally and movingit-s outer end away fromthe base-bar, while in the other figures the angle-bar is held fromlongitudinal movement by the arm 0 and the pivot 7b of the link g ismovable in the basebar.

Figs. 1 and 5 show the two bars connected near their opposite ends bytwo links g and g, their pivots h and 72, being fitted to slots 'n and'11 upon the base-bar and each provided with a draw-bar i orj, extendedto the handle Z). A clamp screw 0 is extended through the base-bar, andthe draw-bars are provided each with a slot 7, fitted to such screw.

To use the gage thus constructed,the clampscrews 6 and 0 are loosened,the instrument is placed in the keyway, and the two drawbars are pulledsimultaneously by means of their hooks. The links 9 and g thus force theopposite ends of the angle-bar outward and independently adjusting themautomatically to the angle of the keyway. The clamp or screw 0 is thentightened to secure the d raw-bars, and the clamp-screw e is tightenedto secure the angle-bar in its adjusted position.

It will be observed that the clamp-screw 0 serves to lock the draw-barst' andj when the links and the angle-bar are adjusted and that thethread u pen the thu mb-screw It serves also to lock the draw-barj,which is shown in Fig. 1, when the angle-bar is adjusted, and I havetherefore claimed, broadly, the combination, with the d raw-bar, ofmeans for locking the same.

Having thus set forth the nature of the invention, what is claimedherein is-- 1. In a key-gage, the combinatio11,witl1 the base-bar athaving the lateral arm 0 at its outer end provided with slot cl andclampscrew e, of the angle-barf connected with the inner end of thebase-bar C0 by link g, and clamped to the arm, when adjusted, by theclamp-screw e.

2. In a key-gage, the combination,with the base-bar to having at itsinner end the slot at and at its outer end the lateral arm 0 providedwith the slot 01 and clamp-screw e, of the angle-barfjointed upon theclamp-screw and held from longitudinal motion thereby, the link gjointed to the angle-bar and having pivot h fitted to the slot at, adraw-bar for drawing, the link. toward the outer end of the base-bar,andmeans for locking such drawbar when adjusted.

3. In a key-gage, the combination,with the basebar at having at itsinner end the slot 91 and at its outer end the slot 11', and lateral arm0 provided with slot (1 and clamp-screw e, of the angle-barfjointed uponthe clampscrew as set forth, the links g and g jointed to the angle-barand having their pivots it, h, fitted to the slots at, 11, separatedraw-bars attached to the pivots h, 7L, and means for locking thedraw-bars when the angle'har is adjusted.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOSEPH AOKERLY.

\Vitnesses:

THOMAS S. CRANE, L. LEE.

